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The ePUB file type is an open source format developed by the International Digital Publishing Forum (IDPF) . Based on XHTML, XML and CSS it works well with a number of software applications which has helped the popularity of the format grow. Despite this, there are a raft of rules that must be adhered to when creating an ePUB file which has attracted criticism of the format. The format allows DRM protection to be added to a file.

The ePUB format allows reflowable content. This means that the content fits the size and shape of the screen it is being displayed upon, in the same way that text on an HTML page changes depending on the size of the display. An ePUB file tends to consist of three elements: archive, metadata and content.

The file type .prc is an eBook format created by a French eBook company called Mobipocket which created a free software application for multiple devices including PDAs, smartphones and tablet devices. The .prc extension is actually identical to .mobi extension but is used specifically for Palm devices which only support .prc or .pdb extensions.

The eBook format is based on XHTML and also allows for frames and JavaScript. The format supports DRM protection, images and tables. It also allows for interactive actions such as adding notes, corrections, annotations and bookmarking. The format was designed to optimise certain elements such as images for mobiel devices on low bandwidth.